Hi, there!
Or rather, "Bright Suns!" as they say in Batuu. I'm so excited to hear you'll soon be experiencing out-of-this-world adventures in
Star Wars: Galaxy's Edge!
I can sense the Force is strong with you - well done on getting that reservation at
Savi's Workshop. While I haven't constructed my own lightsaber under the guidance of the "Gatherers" quite yet, I did some research to get the answers you're seeking. There are
rental lockers at Disney's Hollywood Studios, but your handbuilt lightsaber will be too big for a locker to accommodate. There are some attractions that you'll be able to experience with your lightsaber safely stowed in it's carrying case. On other attractions, though, you would need to ask a non-riding friend or even a Cast Member at the attraction to hold it for you. In that case, there would be a bit of a risk in that the Cast Member would not be responsible if the lightsaber was lost, stolen, or damaged. It's possible that the Gatherers at Savi's Workshop could hold it for you while you explore
Disney's Hollywood Studios. I suggest you inquire about that option as soon as you check-in for your reservation.
My best advice is to have your custom lightsaber shipped safely home. Stop by
First Order Cargo for information on current pricing to
ship your lightsaber home via UPS or FedEx.
Make sure you take lots of incredible photos with your lightsaber throughout Black Spire Outpost. A
360° Photo of Batuu with a Tiny World Magic Shot would be exceptionally cool!
I hope this was helpful, Nicole. I'm wishing you a force-filled visit to
Star Wars: Galaxy's Edge!
Ashley